the color tune is a good concept, doesn't work as well in application. Is it any better than using fresh plugs and doing some laps and looking at the plugs?

realistically. use the wideband 02 meter, as everything else is fluff. even EGT, since you need a complicated chart to make it mean anything, and if you don't know if you're rich/lean it won't help anyways.

Like B210 sleeper said,buy one on ebay, the seller can post it to South Africa.

http://search.ebay.com/search/search.dll?from=R40&satitle=colortune

If I remember rightly these were supposed to be used to adjust the idle mixture setting of your carburettor as you needed to be able to see the colour of the flame through the clear insulator of these spark plug substitutes while making the adjustment & reading the chart to make sure that you got it right.

It's very difficult to look at them while the car is being driven, & reving up the engine does not substitute for driving with a load on the engine, so idle mixture tuning was a practical limit for them.
They were not intended to be used as 'in service' spark plugs either as they did not come in a variety of heat ranges.

With the industry wide shift to EFI [no new cars with carbs to adjust] & the novelty value of these gimmicks wearing off, sales fell off & manufacture came to an end.

Many people discovered that the idle mixture adjustment could be done just as well with a good old vacuum guage &/or a tachometer which were much easier to fit & use than changing a spark plug twice. [remove spark plug & fit colourtune, then remove it & refit a real plug.] Oh yeah, they were also difficult to use if you were doing a tune up in your driveway in the strong sunlight of a lovely summers day, so you needed someplace well shaded to do it, or better yet, do it at night to get a real good look at the colour of the combustion.

Good fortune to you in locating one.

I don't know if they make them still, or where they come from. try ebay.

weird how nobody ever mentioned these color tune things then suddenly all these questions...

did you buy that weber tuning book?

SEEMS AS IF IM ASKING THE WRONG QUESTION OR THAT I ASKED THE QUESTION WRONG BUT NOBODY SEEMS TO BE INTERESTED IN HELPING.

I HAVE 45 VIEWS BUT NOT A SINGLE REPLY ON FINDING A COLORTUNE

WHAT DO I NEED TO DO TO GET SOME HELP, PLEASE